Over the years I have been asked how to properly store gasoline and diesel for emergencies. There are methods to extend the storage life, but they are not great long term storage survival fuels. Ideally we wouldn’t need fossil fuels at all, but there are instances where it’s prudent to have some on hand, and propane does store the best.
Propane can be used for cooking, heating (water and space), refrigeration, lighting, clothes drying, and electrical generation. It can even be used a transportation fuel. Electrical generators and transportation consume large amounts of propane, where the other devices use much less. It’s a clean burning fuel, emitting mostly Carbon Dioxide and water vapor. Use plenty of ventilation, and use a Carbon Monoxide and Propane leak detectors for safety.
Theoretically, propane might store forever. The tanks would rust out and the propane would leak long before the propane would go bad, so tank storage is the main concern. Keeping the bottles dry and clean are the first priority, and keeping the bottles cool <100 so the pressure release valves don't release excess pressure. Keep them outdoors, as you don't want possible leaks in the house, and since propane is heavier than air, it would pool in the lowest areas. If you live in a cold climate, propane stops flowing at around -44F, so that may be a concern. I've used a wood fired cookstove and wood stove for heating for many years, but if you don't have a sustainable source of woody material, or are not physically capable of cutting, splitting and hauling, it would be prudent to have a good supply of propane stored just in case. The difference between an emergency and an inconvenience is preparation. - http://groups.yahoo.com/group/PracticalSurvival3/